This 3000 mAh power bank is just a little larger than the size of a credit card and only 1/4" thick enabling it to fit in most wallets comfortably. This power bank will charge both Android and IPhones with its lightening adapter (included). Requires a micro USB cord to charge the power bank. Sold separately. 3.7" x 2.4" x .25" Battery is UL Certified.